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• DNS problems on CentOS fresh install

  - by Rick Koshi

  I'm having some DNS issues on a new box I'm installing with CentOS 6.2. I am able to look up names using nslookup, dig, or host. I am able to ping machines by name or by IP address. However, when I try other tools, such as ssh, wget, or yum, they are unable to resolve names. For example: # wget http://www.google.com --2012-03-08 14:48:06-- http://www.google.com/ Resolving www.google.com... failed: Name or service not known. wget: unable to resolve host address `www.google.com' # ssh www.google.com ssh: Could not resolve hostname www.google.com: Name or service not known # ping -c 1 www.google.com PING www.l.google.com (74.125.113.106) 56(84) bytes of data. 64 bytes from vw-in-f106.1e100.net (74.125.113.106): icmp_seq=1 ttl=46 time=43.6 ms --- www.l.google.com ping statistics --- 1 packets transmitted, 1 received, 0% packet loss, time 59ms rtt min/avg/max/mdev = 43.665/43.665/43.665/0.000 ms # host www.google.com www.google.com is an alias for www.l.google.com. www.l.google.com has address 74.125.113.99 www.l.google.com has address 74.125.113.103 www.l.google.com has address 74.125.113.104 www.l.google.com has address 74.125.113.105 www.l.google.com has address 74.125.113.106 www.l.google.com has address 74.125.113.147 My /etc/nsswitch.conf file is the default, including this (standard) line: hosts: files dns /etc/resolv.conf is as set up by DHCP: ; generated by /sbin/dhclient-script nameserver 192.168.1.254 192.168.1.254 is a working DNS server (my DSL modem, working for years with other machines) Anyone know why ping would work, but ssh/wget would fail? Per NcA's suggestion, I tried changing /etc/resolv.conf to point to 8.8.8.8. Oddly enough, this does make it work. Obviously, my DSL modem is responding to DNS requests in some way that some parts of Linux's resolution system don't like. Looking at the tcpdump, I am unable to see what the difference is. Certainly, both servers are sending the same addresses. Here's the output from tcpdump -nn -X with the server set to the DNS server on the DSL modem. It's clearly replying with the correct addresses, but ssh/wget don't seem happy with it for some reason: 15:53:52.133580 IP 192.168.1.254.53 > 192.168.1.2.54836: 33157 7/0/0 CNAME www.l.google.com., A 74.125.115.105, A 74.125.115.106, A 74.125.115.147, A 74.125.115.99, A 74.125.115.103, A 74.125.115.104 (148) 0x0000: 4500 00b0 e33a 0000 ff11 53b1 c0a8 01fe E....:....S..... 0x0010: c0a8 0102 0035 d634 009c 7528 8185 8180 .....5.4..u(.... 0x0020: 0001 0007 0000 0000 0377 7777 0667 6f6f .........www.goo 0x0030: 676c 6503 636f 6d00 0001 0001 c00c 0005 gle.com......... 0x0040: 0001 0007 acd0 0008 0377 7777 016c c010 .........www.l.. 0x0050: c02c 0001 0001 0000 0001 0004 4a7d 7369 .,..........J}si 0x0060: c02c 0001 0001 0000 0001 0004 4a7d 736a .,..........J}sj 0x0070: c02c 0001 0001 0000 0001 0004 4a7d 7393 .,..........J}s. 0x0080: c02c 0001 0001 0000 0001 0004 4a7d 7363 .,..........J}sc 0x0090: c02c 0001 0001 0000 0001 0004 4a7d 7367 .,..........J}sg 0x00a0: c02c 0001 0001 0000 0001 0004 4a7d 7368 .,..........J}sh 15:53:52.135669 IP 192.168.1.254.53 > 192.168.1.2.54836: 65062- 0/0/0 (32) 0x0000: 4500 003c e33b 0000 ff11 5424 c0a8 01fe E..<.;....T$.... 0x0010: c0a8 0102 0035 d634 0028 98f9 fe26 8000 .....5.4.(...&.. 0x0020: 0001 0000 0000 0000 0377 7777 0667 6f6f .........www.goo 0x0030: 676c 6503 636f 6d00 001c 0001 gle.com..... I'm not enough of an expert to know if this is malformed in some way, but ping seems to do the right thing with it. For comparison, here's the same thing when querying 8.8.8.8: 15:57:27.990270 IP 8.8.8.8.53 > 192.168.1.2.49028: 59114 7/0/0 CNAME www.l.google.com., A 74.125.113.105, A 74.125.113.103, A 74.125.113.106, A 74.125.113.147, A 74.125.113.104, A 74.125.113.99 (148) 0x0000: 4500 00b0 5530 0000 2f11 6453 0808 0808 E...U0../.dS.... 0x0010: c0a8 0102 0035 bf84 009c 39f8 e6ea 8180 .....5....9..... 0x0020: 0001 0007 0000 0000 0377 7777 0667 6f6f .........www.goo 0x0030: 676c 6503 636f 6d00 0001 0001 c00c 0005 gle.com......... 0x0040: 0001 0001 516a 0008 0377 7777 016c c010 ....Qj...www.l.. 0x0050: c02c 0001 0001 0000 0116 0004 4a7d 7169 .,..........J}qi 0x0060: c02c 0001 0001 0000 0116 0004 4a7d 7167 .,..........J}qg 0x0070: c02c 0001 0001 0000 0116 0004 4a7d 716a .,..........J}qj 0x0080: c02c 0001 0001 0000 0116 0004 4a7d 7193 .,..........J}q. 0x0090: c02c 0001 0001 0000 0116 0004 4a7d 7168 .,..........J}qh 0x00a0: c02c 0001 0001 0000 0116 0004 4a7d 7163 .,..........J}qc 15:57:28.018909 IP 8.8.8.8.53 > 192.168.1.2.49028: 31984 1/1/0 CNAME www.l.google.com. (102) 0x0000: 4500 0082 7b1b 0000 2f11 3e96 0808 0808 E...{.../.>..... 0x0010: c0a8 0102 0035 bf84 006e c67e 7cf0 8180 .....5...n.~|... 0x0020: 0001 0001 0001 0000 0377 7777 0667 6f6f .........www.goo 0x0030: 676c 6503 636f 6d00 001c 0001 c00c 0005 gle.com......... 0x0040: 0001 0001 517f 0008 0377 7777 016c c010 ....Q....www.l.. 0x0050: c030 0006 0001 0000 0258 0026 036e 7334 .0.......X.&.ns4 0x0060: c010 0964 6e73 2d61 646d 696e c010 0016 ...dns-admin.... 0x0070: 91f3 0000 0384 0000 0384 0000 0708 0000 ................ 0x0080: 003c .< I still don't know why the server's reply is adequate for ping but not for ssh/wget. If anyone has ideas, I'd be happy to hear them. For now, though, I can either refer to an outside DNS server or set up my own server on the new box. It's a workaround that seems like it should be unnecessary, but will allow me to proceed.

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• Ubuntu VPN Server (PPTPD) Configuration - Pass Traffic to Internet

  - by SnAzBaZ

  I am trying to configure PPTPD on my Ubuntu box to pass all VPN traffic through to it's internet connection, so I essentially want it to work like a Proxy. I think the problem is that no default gateway is being assigned to my PPTP client (Windows 7). I can connect to the VPN fine, I get an IP address and DNS servers but no default gateway. Do I need to configure a specific option to tell the VPN server to forward all traffic it receives down it's eth0 port and out to the internet. Thanks!

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• e-mail no longer coming to aol inbox since I opened a Hotmail account [closed]

  - by Dave

  I recently set up an email account with Hotmail. I have used AOL e-mail for years and would like to keep this as my main source for sending/receiving e-mail. When I set up the Hotmail account there was an option to have all my e-mail accounts forwarded to the Hotmail inbox. I set up this option and the page promised that all incoming mail would still be visible in the original inbox, in this case my AOL account. Well everything does come to the Hotmail account, the only problem is that I no longer receive these e-mails in my primary/desired location which is AOL. I went back and made sure the box was checked that provided the option through Hotmail that said "leave a copy of my messages on the server" (AOL) How do I get the e-mail that is being forwarded to Hotmail from my AOL account to still be visible in AOL, it should be in AOL inbox as that is the original destination but it is gone. Suggestions?

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• Can I set up a 2nd home wireless router, with router2 connecting to the internet through a desktop which is wirelessly connected to router1?

  - by gil b.

  Hi, I apologize for the crudeness of my MSPaint drawing, but please view my diagram of what I'd like to accomplish: Proposed home network architecture Currently, all devices are connected to 1 wireless router. I would like to make my own subnet, with a box in-between my subnet and the shared wireless router, so that I can learn about IDS, traffic analysis, etc. I was also given a cisco PIX firewall to play around with, and it'd be an added bonus if I could incorporate that into my network. The reason for this proposed architecture is so that I can monitor all MY traffic, without seeing anything going on with my roommates' traffic. my MAIN Question is, is it possible to have my desktop connect to the wireless router with internet via wireless card AND share that connection via the ethernet card, hooked to wireless router 2? cable modem - wireless router - desktop pc connected wirelessly - wireless router 2 getting internet from wired connection to desktop pc - laptops connected wirelessly The PIX can be left out for now, but I'm wondering if it could eventually be incorporated? THANKS!

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• MacBook Pro (with DVI) to HDMI, including audio - possible?

  - by Jason

  I have a MacBook Pro with DVI. I'd like to hook it up to my living room TV for movies and such but I want to keep it out of the way. I already have HDMI cables run to the basement where I have a cable box. Is there something I could you to connect the MBP video and audio to HDMI so I only need the one cable to the TV? I'm looking for a quality picture but I don't want to spend a ton of $. I've googled a bit, but I'm looking for some recommendations.

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• Ubuntu server hangs on reboot "could not stat resume device file"

  - by matnagel

  Instead of booting into the running system this machine stops and on the terminal I can see a message: could not stat resume device file /dev/sdb5 When I attach a keyboard and press enter the boot continues and the machine comes up like normal. But it's essential that this machine comes up under most circumstancs alone. There never was something like a "resume" on this machine. I tried several times to reboot, but this does not happen on all boots, I can not find a pattern here. There is a software raid running on the box. This is the syslog during boot: http://privatepaste.com/ff0fd0a51c/sdabfjahfgasjkgfu4gfsdzjcgfafasdjfhgasdcjfgauzfgafasgdufzg How can I get rid of this boot failure? We do not need resumes and best would be something that works here and now.

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• This operation has been cancelled due to restrictions in effect on this computer

  - by Dan

  I have this HUGELY irritating problem on Windows 7 (x64). Whenever I click on ANY link (that exists on a Word document, Excel or Outlook), I get an alert box with the message: This operation has been canceled due to restrictions in effect on this computer I have been scouring my settings and the Internet for a solution, but to no avail. What is the reason for this problem? It even happens when I click anchors in word document. That is, I can't even click on an entry in a Table of Contents to go to the appropriate page - I get this same error then. Is this a Windows 7 thing? Is there any way to turn this off?

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• What would cause a CMD window to open after windows starts?

  - by Carl B

  As of the past few weeks, when I start windows, A CMD window opens and stays open after all the programs and applications launch. I have just been exiting or closing the box, but I have been wondering what would cause it to open in the first place? I have checked to see what is in start up (and I have been looking for CMD or RUN) but I don't see anything out of the ordinary. How can I get this to stop? I have windows 7 Home premium 64.

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• Exclude path from Windows 7 search?

  - by Jez

  It's really quite incredible how bad Windows 7's search seems to be. The latest problem I have with it is that I want to search for filenames including the string "user", so I go to the directory I want to search in (C:\Users\jez\testing), type *user* in the search box, and hit enter. It gives me... every single file. Because "user" is in the path of every file, with everything being under "C:\Users..." OK, this is useless. Is there a way to just search for the string within files rather than their paths, or do I need to download some decent 3rd party search software?

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• How can I determine whether an Antivirus product is installed?

  - by Chris Lively

  We have a large installation with over 15,000 machines. They are supposed to have a version of Trend Micro installed; however, we don't know that for sure. These are all Windows boxes which includes XP with various SP levels, Vista both RTM and SP1, and several 2000 and 2003 servers. How can I determine: Whether ANY AV product is installed? What version of the product is installed? What version of the pattern file is on the box? Ideas? Thanks,

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• Windows Server 2008 SOMETIMES blocks connection to an FTP Site

  - by ssilver2k2

  Hello Everyone Recently, our company has been having issue connecting to a special FTP server that we use offsite to upload small files. We can connect to the test server perfectly fine, but when we use the production ftp, it only randomly connects. If I plug my laptop directly into the modem and pull one of our other static IP addresses, I can connect just fine, but if I use our internal network, it is hit or miss. Also, turning OFF the firewall does NOT change the status of our connection problems. It will still time out. The weird issue is that it sometimes works, and when it does, it instantly asks for credentials and logs us on for that session, but if we disconnect and try again, it may or may not work. This also coincidentally occurred after uninstalling hamachi, and it blew away our internet settings on our Windows Server 2008 box, but everything else is working fine, and it was working fine before hamachi was installed.

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• Attempting to caue packet loss with netem doesn't work - possibly because of NAT (but delay does work)

  - by tomdee

  I have traffic from a WIFI access point routed via an Ubuntu box. I have two network interfaces which are NATed *filter :INPUT ACCEPT [11:690] :FORWARD ACCEPT [0:0] :OUTPUT ACCEPT [37:6224] -A FORWARD -s 192.168.2.0/24 -i eth1 -o eth0 -m conntrack --ctstate NEW -j ACCEPT -A FORWARD -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT COMMIT # Completed on Thu Mar 15 13:37:21 2012 # Generated by iptables-save v1.4.10 on Thu Mar 15 13:37:21 2012 *nat :PREROUTING ACCEPT [0:0] :INPUT ACCEPT [0:0] :OUTPUT ACCEPT [0:0] :POSTROUTING ACCEPT [0:0] -A POSTROUTING -j MASQUERADE COMMIT If I run a ping app on an Android device connected to the WIFI network I can happily ping google. If I use netem to introduce some delay tc qdisc change dev eth0 root netem delay 100ms I can clearly see pings taking longer. If I use netem to introduce some packet loss tc qdisc change dev ifb0 root netem loss 50% then I see no change. Packet loss does work fine for locally generated traffic, just not for traffic coming in over the network that's being NATed. Any ideas how to sort this out?

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• Fedora Core 11 won't boot without a monitor

  - by feihtthief

  I have a P4 system that I installed Fedora 11 on. It will not boot without a monitor attached. The monitor can be off (not even have power plugged in), but must be attached. Without a monitor the hard disk thrashes around a bit like it's starting up services, but does not get to the point where I can ssh into the box. I have set the default runlevel to 3 and removed the rhgb entry from grub. Any suggestions welcome. Edit: I have already set the run-level to 3. The machine boots up fine with the monitor plugged in to the point where I can SSH into it. as soon as i unplug the monitor and reboot, it will not boot to that point.

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• Has anyone experienced "Screen Painting" issues with RealVNC?

  - by cybersylum

  I've just setup remote access to a Windows XP box using RealVNC. When the user runs an app, they expierence issues with "screen painting" - the screen doesn't paint well, except for a radius around the mouse cursor. The app is displaying a calendar. I am not sure what it is written in (think it is a .NET app) Have no problems getting/staying connected. Initially it seemed to be working fine. I have looked through all of the settings as far as compression and speed. I can replicate the issue from more than 1 location. The hosting Internet connection is DSL.

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• Why does my PC sometimes think I am constantly pressing the control key?

  - by David Faux

  I was browsing the web with Chrome and pressed f. A search box appeared. I then pressed s, after which Chrome asked if I wanted to save the web page. I soon realized that my PC was thinking that I was constantly pressing the Ctrl key regardless of what program I was using. In response, I tried clicking both of my Ctrl keys a few times to no avail. This problem arises sporadically as I work. I am not sure what is triggering it. Why could this problem be occurring? Is it the keyboard or software? How should I respond?

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• MLGPO for Windows Server 2003 R2?

  - by 5graeham5

  Is there something like MLGPO (Multiple Local Group Policy Objects) for Windows Server 2003 R2? I have a 2003 Terminal Server that isn't part of a domain/AD and I'm trying to set local group policies which applies only to certain users and/or groups and the policies differ between those entities. I wanted to avoid using the file permissions trick for on C:\WINDOWS\system32\GroupPolicy as that's an all-or-nothing approach. I can't upgrade this box to Windows Server 2008 as the software used is only supported and only works on 2003. Are there any third-party tools to achieve this?

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• GParted tells me my partition has 1.30 GiB used space but I cannot access its contents

  - by reprogrammer

  I've a ext4 partition (/dev/sda7) for my Linux. And, another (/dev/sda5) for keeping my data. When I installing Ubuntu 10.04 LTS, I set the mount point of /dev/sda5 to "/" and that of /dev/sda5 to "/data". GParted tells me that 1.30 GiB out of 70.12 GiB of /dev/sda5 has been used up. But, the mounted directory "/data" is empty. So, it looks like that my data is there but I cannot access it. Besides, when I set the mount point, I didn't check the "format" box. So, it shouldn't have been formatted. How can I check whether the partition has been formatted? How can I recover my files?

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• How to query a DHCP server to get the local DNS servers

  - by Dan Berlyoung

  I have a ClarkConnect (CentOS based) box running as my home router on a RR connection. I had the DNS servers set up to use Google's DNS server. I want to change them back to the local DNS servers but I can't find an obvious/easy way to get those address short of a) reconfiguring the router's network to DHCP them (would rather not interrupt everyone) or b) calling their tech support (kill me now!). Is there a command line tool/command I can use to query the DHCP server on the external NIC to see what DNS servers it would set me up with w/o munging my existing setup?

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• dd-wrt switch for PfSense

  - by Kmao

  I currently have eth2 on my pfsense set up, and configured as 192.168.1.1, it has dhcp setup with allocation being 192.168.1.10 - 192.168.1.245. On my dd-wrt box, i disabled the WAN, and set it to act as a port for the switch. I disabled dhcp, dnsmasq, spi firewall, Wlan0 and set a static IP for the router being 192.168.1.10 Pfsense is plugged into lan0 and pc plugged into lan1 (wan port is empty) I have followed a few different guides, but i can't seem to get my router to act as a switch. Anyone have success using DD-WRT as a switch while using pfsense as your dhcp/dns/gateway. Any advice would help :)

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• Why doesn't this script work?

  - by Devin

  I've been using this bash script: for i in $(ls); do mv $i a$i; done to prepend all filenames in a folder with the letter a. I'm afraid that at some point I'll accidentally use this script in the wrong directory and prepend a ton of filenames that I don't want prepended. So I decided to explicitly cite the path to the file. So now my script looks like this: for i in $(ls /cygdrive/c/Users/path/to/Images); do mv /cygdrive/c/Users/path/to/Images/$i /cygdrive/c/Users/path/to/Images/a$i; done It does prepend the filename with the letter a, but it also appends the filename with this ? symbol. Any ideas why it would do that? If it helps any, I'm using cygwin on a Windows 7 box. Thanks for the help!

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• Remote Desktop fails with no error

  - by Duane

  Recently, I've been having problems connecting to a remote machine via RDP. I can connect fine exactly once, but all subsequent attempts fail until the remote machine is rebooted. I seem to authenticate properly, but the RDP logon dialog disappears after showing, "Configuring remote session..." for a few seconds. No errors or other useful info is written either to my screen or the Event Logs of the two machines involved. I've tried disabling remote sound as others have suggested, with no success. I'm still investigating a solution, but would appreciate any thoughts. Fortunately, I can reboot the box remotely w/o causing any problems, but this is a less than ideal workaround.

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• Cisco VPN Client on Vista - Virtual Adapter

  - by ScaleOvenStove

  I have used the Cisco VPN client for years, and on XP it is pretty much rock solid, on Vista, not so much. You might be able to connect, but unless you set up a constant ping to something, it usually will disconnect, with this error: Reason 442: Failed to enable Virtual Adapater Now, most sysadmins will say, update you client - yes, I know, it hasnt mitigated the issue, ever. I have been using it on Vista since it came out, and updated my client every time a new update comes out. I have used it where the VPN server was a Cisco PIX and a Windows Box allowing the Cisco Client to connect. Anyone have any fixes that you can do on your client to fix this issue?

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• How can I read a reel-to-reel tape from the 1970s?

  - by Joe Wreschnig

  A close friend of my mother worked at DEC in the 1970s and 1980s. She recently passed away, and in sorting through her estate, my mother discovered some reel-to-reel magnetic tape. We are curious about what might be on it. I haven't yet seen a picture of it, but Wikipedia tells me this is most likely DECtape. Is there any chance the data on it is still good? It was not preserved with great care, but as far as we know it has also never been particularly abused. Just left in a box and moved a few times. If the data is still valid, do we need to dig up a PDP or VAX or read it, or is there a more modern option?

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• Moving FederatedEmail/SystemMailbox from One Store to Another - Exchange 2010

  - by ThaKidd

  Hello all. Just upgraded from Exchange 2003 to 2010. Somehow, I have two mailbox databases on my single Exchange 2010 server. One database contains all of the mailboxes I had moved from the 2003 exchange server; the other contains two SystemMailboxes and one FederatedEmail box. I am just starting to get a grasp on the commands used in the EMS. I was wondering if someone could point me in the right direction to move these three "system" mailboxes into my actual mailbox database so I can eliminate the second database. Just trying to sure up this one server before I role out my backup Exchange server. Thanks in advance! Your help and ideas are greatly appreciated as I try to make this setup as simple as possible.

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• When send a meeting invite to a specific user, you get a undeliverable response back from another us

  - by jherlitz

  We have a user, where it doesn't matter who sends it, but if you send her a meeting invite through outlook (exchange 2007), you get a non-deliverable message back from another user. Same one all the time though. I checked her shared calendar properties and removed the user from the list. I checked and made sure she wasn't using cache mode. I checked the manage full permissions and send permissions within exchange and the user is not listed. What am I missing? Notes: Using Outlook 2007 with Exchange 2007 on a XP box and Server 2008.

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